Lattice-induced sound trapping in biperiodic metasurfaces of acoustic resonators
Abstract
A referential example of a physical system that supports bound states in the continuum (BICs) with an infinite quality factor (Q factor) is a metasurface of discrete scatterers (resonators), whose response can be significantly modified by exploiting lattice interactions. In this work, we explore the multipole-interference mechanism for realizing accidental acoustic BICs (trapped modes) at Γ point (in-plane Bloch wave vector k∥=0) of biperiodic metasurfaces of acoustic resonators with one resonator per unit cell. To do so, we expand the pressure field from the metasurface into a series of scalar zonal (m=0) spherical multipoles, carried by a normally incident plane wave, and formulate analytical conditions on the resonator multipole moments under which an eigenmode becomes a BIC. The conditions enable us to determine the lattice constant and frequency values that facilitate the formation of an axisymmetric BIC with a specific parity, resulting from destructive interference between zonal multipoles of the same parity, despite each moment radiating individually. By employing the T-matrix method for acoustic metasurfaces, we numerically investigate the BIC resonance in various structures, including finite arrays, and also the transformation of such resonances into high-Q quasi-BIC regimes, which can be excited by a plane wave at normal incidence.
Details
- Organisationseinheit(en)
-
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
Institut für Quantenoptik
- Externe Organisation(en)
-
Karlsruher Institut für Technologie (KIT)
University of Athens
Purdue University
- Typ
- Artikel
- Journal
- Physical Review Research
- Band
- 8
- ISSN
- 2643-1564
- Publikationsdatum
- 23.01.2026
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Allgemeine Physik und Astronomie
- Elektronische Version(en)
-
https://doi.org/10.1103/wnmk-zhrb (Zugang:
Offen
)
